Legibility is one of the most cited advantages of tool watch. Their most practical use, often equipped with lume is the ability to tell time even in the worst conditions. This includes murky water, a cave, or the dark.

Lume was first developed in the early 1920s,Rolex Datejust Replica Watches when soldiers needed watches that were easy to read at low light. Since then, many materials have been developed to make markers glow at night. Rolex Datejust Replica Watches is the leader in the market with Chromalight. This material glows twice as long as other luminous materials.

This guide will take a look at the Rolex Datejust Replica Watches luminous material and all of their materials used over their history.

photo: PhillipsRADIUMThe first luminous material used in Rolex Datejust Replica Watches watches was radium; and it remained the standard until 1963.

The effects of exposure to radiation were not fully understood until factory workers became ill from the toxic substance. Patek Philippe Replica Watches recalled Rolex Datejust Replica Watches GMT Master ref 6542 watches that had radium bezels at one point and offered to replace them for free with aluminum bezels.

Rolex Datejust Replica Watches replaced radium with Tritium after radium had been deemed unsafe.

Rolex Datejust Replica Watches Seadweller Vintage Steel Mens Watch - 1665TRITIUMTritium, like radium is radioactive. However, it has a lower radiation level and a shorter half-life.